Examples of org.apache.derby.iapi.types.RowLocation

org.apache.derby.iapi.types.RowLocation
Holds the location of a row within a given conglomerate. A row location is not valid except in the conglomerate from which it was obtained. They are used to identify rows for fetches, deletes, and updates through a conglomerate controller.
See the conglomerate implementation specification for information about the conditions under which a row location remains valid.

    {
      indexSC = activation.getIndexScanController();
    }
    else if (indexSC == null)
    {
      RowLocation templateBaseRowLocation = baseCC.newRowLocationTemplate();
      /* DataDictionary doesn't have compiled info */
      if (indexSCOCI == null)
      {
        indexSC = 
                tc.openScan(

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    }


    /* Set up sorters, etc. if 1st row and there are indexes */
    if (constants.irgs.length > 0)
    {
      RowLocation rlClone = (RowLocation) rowLocation.cloneObject();


      // Objectify any the streaming columns that are indexed.
      for (int i = 0; i < execRow.getRowArray().length; i++)
      {
        if (! constants.indexedCols[i])

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        // Calculate the approximate row size for the index row
        approximateRowSize += dts.getTypeId().getApproximateLengthInBytes(dts);
      }


      // Get an array of RowLocation template
      RowLocation rl[] = new RowLocation[bulkFetchSize];
      for (int i = 0; i < bulkFetchSize; i++)
      {
        rl[i] = scan.newRowLocationTemplate();


        // Get an index row based on the base row

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  boolean  collectAffectedRows() throws StandardException
  {  


    DataValueDescriptor    rlColumn;
    RowLocation  baseRowLocation;
    boolean rowsFound = false;


    if(cascadeDelete)
      row = getNextRowCore(source);

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  //during cascade delete (All deletes are deferred during cascade action)
  void deleteDeferredRows() throws StandardException
  {
    
    DataValueDescriptor    rlColumn;
     RowLocation  baseRowLocation;
    ExecRow    deferredRLRow = null;


    deferredBaseCC = tc.openCompiledConglomerate(false,
                           tc.OPENMODE_FORUPDATE|tc.OPENMODE_SECONDARY_LOCKED,
                           lockMode,

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  {
    if (! isOpen) return null;


    // REVISIT: could we reuse the same rowlocation object
    // across several calls?
    RowLocation rl;
    rl = scanController.newRowLocationTemplate();
    scanController.fetchLocation(rl);
    return rl;
  }

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        evaluateCheckConstraints( checkGM, activation );


        /* Get the RowLocation to update 
         * NOTE - Column #s in the Row are 1 based.
         */
        RowLocation baseRowLocation = (RowLocation)
          (row.getColumn(resultWidth)).getObject();


        RowUtil.copyRefColumns(newBaseRow,
                    row,
                    numberOfBaseColumns,

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       * as the comments above this function say, we scan forward.
       *
       * Need to save a clone because when we get cached currentRow, "rl" shares the
       * same reference, so is changed at the same time.
       */
      RowLocation updatedRL = (RowLocation) rl.getClone();


      if (past2FutureTbl.size() < maxCapacity)
        past2FutureTbl.put(updatedRL, updatedRL);
      else
      {
        tableScan.skipFutureRowHolder = true;
        ExecRow rlRow = new ValueRow(1);


        for (;;)
        {
          ExecRow aRow = tableScan.getNextRowCore();
          if (aRow == null)
          {
            tableScan.sourceDrained = true;
            tableScan.past2FutureTbl = null;  // de-reference for garbage coll.
            break;
          }
          RowLocation rowLoc = (RowLocation) aRow.getColumn(aRow.nColumns());


          if (updatedRL.equals(rowLoc))  //this row we are updating jumped forward
          {
            saveLastCusorKey(tableScan, aRow);
            break;  // don't need to worry about adding this row to hash any more

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          /* 
          ** The last column is a Ref, which contains a 
          ** RowLocation.
          */
          DataValueDescriptor rlColumn = deferredTempRow2.getColumn(numberOfBaseColumns + 1);
          RowLocation baseRowLocation = 
              (RowLocation) (rlColumn).getObject();
  
          /* Get the base row at the given RowLocation */
          boolean row_exists = 
            deferredBaseCC.fetch(

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      }


      positionInSource++;
      currentPosition = positionInSource;


      RowLocation rowLoc = null;
      if (source.isForUpdate()) {
        rowLoc = ((CursorResultSet)source).getRowLocation();
      }


      addRowToHashTable(sourceRow, currentPosition, rowLoc, false);

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